// SPDX-License-Identifier: GPL-2.0-or-later /* * at91_cf.c -- AT91 CompactFlash controller driver * * Copyright (C) 2005 David Brownell */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/gpio.h> #include <linux/platform_data/atmel.h> #include <linux/io.h> #include <linux/sizes.h> #include <linux/mfd/syscon.h> #include <linux/mfd/syscon/atmel-mc.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_gpio.h> #include <linux/regmap.h> #include <pcmcia/ss.h> /* * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW; * some other bit in {A24,A22..A11} is nREG to flag memory access * (vs attributes). So more than 2KB/region would just be waste. * Note: These are offsets from the physical base address. */ #define CF_ATTR_PHYS (0) #define CF_IO_PHYS (1 << 23) #define CF_MEM_PHYS (0x017ff800) struct regmap *mc; /*--------------------------------------------------------------------------*/ struct at91_cf_socket { struct pcmcia_socket socket; unsigned present:1; struct platform_device *pdev; struct at91_cf_data *board; unsigned long phys_baseaddr; }; static inline int at91_cf_present(struct at91_cf_socket *cf) { return !gpio_get_value(cf->board->det_pin); } /*--------------------------------------------------------------------------*/ static int at91_cf_ss_init(struct pcmcia_socket *s) { return 0; } static irqreturn_t at91_cf_irq(int irq, void *_cf) { struct at91_cf_socket *cf = _cf; if (irq == gpio_to_irq(cf->board->det_pin)) { unsigned present = at91_cf_present(cf); /* kick pccard as needed */ if (present != cf->present) { cf->present = present; dev_dbg(&cf->pdev->dev, "card %s\n", present ? "present" : "gone"); pcmcia_parse_events(&cf->socket, SS_DETECT); } } return IRQ_HANDLED; } static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp) { struct at91_cf_socket *cf; if (!sp) return -EINVAL; cf = container_of(s, struct at91_cf_socket, socket); /* NOTE: CF is always 3VCARD */ if (at91_cf_present(cf)) { int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */ int vcc = gpio_is_valid(cf->board->vcc_pin); *sp = SS_DETECT | SS_3VCARD; if (!rdy || gpio_get_value(cf->board->irq_pin)) *sp |= SS_READY; if (!vcc || gpio_get_value(cf->board->vcc_pin)) *sp |= SS_POWERON; } else *sp = 0; return 0; } static int at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) { struct at91_cf_socket *cf; cf = container_of(sock, struct at91_cf_socket, socket); /* switch Vcc if needed and possible */ if (gpio_is_valid(cf->board->vcc_pin)) { switch (s->Vcc) { case 0: gpio_set_value(cf->board->vcc_pin, 0); break; case 33: gpio_set_value(cf->board->vcc_pin, 1); break; default: return -EINVAL; } } /* toggle reset if needed */ gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET); dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n", s->Vcc, s->io_irq, s->flags, s->csc_mask); return 0; } static int at91_cf_ss_suspend(struct pcmcia_socket *s) { return at91_cf_set_socket(s, &dead_socket); } /* we already mapped the I/O region */ static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) { struct at91_cf_socket *cf; u32 csr; cf = container_of(s, struct at91_cf_socket, socket); io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ); /* * Use 16 bit accesses unless/until we need 8-bit i/o space. * * NOTE: this CF controller ignores IOIS16, so we can't really do * MAP_AUTOSZ. The 16bit mode allows single byte access on either * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many * purposes (and handles ide-cs). * * The 8bit mode is needed for odd byte access on D0-D7. It seems * some cards only like that way to get at the odd byte, despite * CF 3.0 spec table 35 also giving the D8-D15 option. */ if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) { csr = AT91_MC_SMC_DBW_8; dev_dbg(&cf->pdev->dev, "8bit i/o bus\n"); } else { csr = AT91_MC_SMC_DBW_16; dev_dbg(&cf->pdev->dev, "16bit i/o bus\n"); } regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect), AT91_MC_SMC_DBW, csr); io->start = cf->socket.io_offset; io->stop = io->start + SZ_2K - 1; return 0; } /* pcmcia layer maps/unmaps mem regions */ static int at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) { struct at91_cf_socket *cf; if (map->card_start) return -EINVAL; cf = container_of(s, struct at91_cf_socket, socket); map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT); if (map->flags & MAP_ATTRIB) map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS; else map->static_start = cf->phys_baseaddr + CF_MEM_PHYS; return 0; } static struct pccard_operations at91_cf_ops = { .init = at91_cf_ss_init, .suspend = at91_cf_ss_suspend, .get_status = at91_cf_get_status, .set_socket = at91_cf_set_socket, .set_io_map = at91_cf_set_io_map, .set_mem_map = at91_cf_set_mem_map, }; /*--------------------------------------------------------------------------*/ #if defined(CONFIG_OF) static const struct of_device_id at91_cf_dt_ids[] = { { .compatible = "atmel,at91rm9200-cf" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, at91_cf_dt_ids); static int at91_cf_dt_init(struct platform_device *pdev) { struct at91_cf_data *board; board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL); if (!board) return -ENOMEM; board->irq_pin = of_get_gpio(pdev->dev.of_node, 0); board->det_pin = of_get_gpio(pdev->dev.of_node, 1); board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2); board->rst_pin = of_get_gpio(pdev->dev.of_node, 3); pdev->dev.platform_data = board; mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc"); return PTR_ERR_OR_ZERO(mc); } #else static int at91_cf_dt_init(struct platform_device *pdev) { return -ENODEV; } #endif static int at91_cf_probe(struct platform_device *pdev) { struct at91_cf_socket *cf; struct at91_cf_data *board = pdev->dev.platform_data; struct resource *io; int status; if (!board) { status = at91_cf_dt_init(pdev); if (status) return status; board = pdev->dev.platform_data; } if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin)) return -ENODEV; io = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!io) return -ENODEV; cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL); if (!cf) return -ENOMEM; cf->board = board; cf->pdev = pdev; cf->phys_baseaddr = io->start; platform_set_drvdata(pdev, cf); /* must be a GPIO; ergo must trigger on both edges */ status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det"); if (status < 0) return status; status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin), at91_cf_irq, 0, "at91_cf detect", cf); if (status < 0) return status; device_init_wakeup(&pdev->dev, 1); status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst"); if (status < 0) goto fail0a; if (gpio_is_valid(board->vcc_pin)) { status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc"); if (status < 0) goto fail0a; } /* * The card driver will request this irq later as needed. * but it causes lots of "irqNN: nobody cared" messages * unless we report that we handle everything (sigh). * (Note: DK board doesn't wire the IRQ pin...) */ if (gpio_is_valid(board->irq_pin)) { status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq"); if (status < 0) goto fail0a; status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin), at91_cf_irq, IRQF_SHARED, "at91_cf", cf); if (status < 0) goto fail0a; cf->socket.pci_irq = gpio_to_irq(board->irq_pin); } else cf->socket.pci_irq = nr_irqs + 1; /* * pcmcia layer only remaps "real" memory not iospace * io_offset is set to 0x10000 to avoid the check in static_find_io(). * */ cf->socket.io_offset = 0x10000; status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS); if (status) goto fail0a; /* reserve chip-select regions */ if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) { status = -ENXIO; goto fail0a; } dev_info(&pdev->dev, "irqs det #%d, io #%d\n", gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin)); cf->socket.owner = THIS_MODULE; cf->socket.dev.parent = &pdev->dev; cf->socket.ops = &at91_cf_ops; cf->socket.resource_ops = &pccard_static_ops; cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP | SS_CAP_MEM_ALIGN; cf->socket.map_size = SZ_2K; cf->socket.io[0].res = io; status = pcmcia_register_socket(&cf->socket); if (status < 0) goto fail0a; return 0; fail0a: device_init_wakeup(&pdev->dev, 0); return status; } static int at91_cf_remove(struct platform_device *pdev) { struct at91_cf_socket *cf = platform_get_drvdata(pdev); pcmcia_unregister_socket(&cf->socket); device_init_wakeup(&pdev->dev, 0); return 0; } #ifdef CONFIG_PM static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg) { struct at91_cf_socket *cf = platform_get_drvdata(pdev); struct at91_cf_data *board = cf->board; if (device_may_wakeup(&pdev->dev)) { enable_irq_wake(gpio_to_irq(board->det_pin)); if (gpio_is_valid(board->irq_pin)) enable_irq_wake(gpio_to_irq(board->irq_pin)); } return 0; } static int at91_cf_resume(struct platform_device *pdev) { struct at91_cf_socket *cf = platform_get_drvdata(pdev); struct at91_cf_data *board = cf->board; if (device_may_wakeup(&pdev->dev)) { disable_irq_wake(gpio_to_irq(board->det_pin)); if (gpio_is_valid(board->irq_pin)) disable_irq_wake(gpio_to_irq(board->irq_pin)); } return 0; } #else #define at91_cf_suspend NULL #define at91_cf_resume NULL #endif static struct platform_driver at91_cf_driver = { .driver = { .name = "at91_cf", .of_match_table = of_match_ptr(at91_cf_dt_ids), }, .probe = at91_cf_probe, .remove = at91_cf_remove, .suspend = at91_cf_suspend, .resume = at91_cf_resume, }; module_platform_driver(at91_cf_driver); MODULE_DESCRIPTION("AT91 Compact Flash Driver"); MODULE_AUTHOR("David Brownell"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:at91_cf");